The terms simplex and duplex refer to the communication between two host devices. Simplex communication is one way only, whilst duplex describes a two-way communication. With simplex communication, one host transmits, one receives but neither host can both transmit and receive. A good example of this would be an intercom system. A microphone will transmit a message to a receiving speaker in one direction only. The speaker cannot then send a message back, making this circuit only ‘one way’ or simplex. The differences between half and full duplex are also easy to explain. Half duplex denotes that a two-way communication can occur between two devices, but only one at a time. Each device would have to take it in turns to transmit and receive, meaning each device has the ability to do both. Take a walkie-talkie as an example of a half duplex device, only one person can speak at a time by pressing the ‘talk’ button and two-way communication cannot happen simultaneously. The ‘talk’ button is pressed on one device, cutting out the ability for the second device to transmit. The second device can then transmit once the first device has finished, enabling two-way communication. Both walkie-talkie devices can both receive and transmit information. Full duplex is a term relating to two-way communication that can take place simultaneously. A good example of this would be the telephone. Both devices can transmit and receive at the same time, allowing unbroken communication between both devices. The terms simplex and duplex are not restricted to the use of communication. For example, water pipes in a house could be described as simplex, as one host sends the water (a water tank or external source). The water runs in one direction to a ‘receiving’ device " in this instance a tap.
Simplex transmission allows data to travel only in a single, pre specified direction. An example from everyday life is doorbell the signal can go only from the button to the chime. Two other examples are television and radio broadcasting. The simplex standard is relatively uncommon for most types of computer-based telecommunications applications; even devices that are designed primarily to receive information, such as printers must be able to communicate acknowledgement signals back to the sender devices.
In half duplex transmission messages can move in either direction , but only one way at a time. The press to talk radio phones used in police cars employ the half-duplex standard; only one person can talk at a time. Often the line between a desktop workstation and a remote CPU conforms to the half duplex patterns as well. If another computer is transmitting to a workstation, the operator cannot send new messages until the other computer finishes its message to acknowledge an interruption.
Full duplex transmission works like traffic on a busy two way street the flow moves in two directions at the same time. Full-duplexing is ideal for hardware units that need to pass large amounts of data between each other as in mainframe-to-mainframe communications.
Simplex transmission allows data to travel only in a single, pre specified direction. An example from everyday life is doorbell the signal can go only from the button to the chime. Two other examples are television and radio broadcasting. The simplex standard is relatively uncommon for most types of computer-based telecommunications applications; even devices that are designed primarily to receive information, such as printers must be able to communicate acknowledgment signals back to the sender devices.
In half duplex transmission messages can move in either direction , but only one way at a time. The press to talk radio phones used in police cars employ the half-duplex standard; only one person can talk at a time. Often the line between a desktop workstation and a remote CPU conforms to the half duplex patterns as well. If another computer is transmitting to a workstation, the operator cannot send new messages until the other computer finishes its message to acknowledge an interruption.
Full duplex transmission works like traffic on a busy two way street the flow moves in two directions at the same time. Full-duplexing is ideal for hardware units that need to pass large amounts of data between each other as in mainframe-to-mainframe communications. Full duplex transmision is a two way transmission
Simplex: Transmission is one direction only, is common in television and commercial radio. It is not as common data communications because of the one-way nature of the process but simplex systems are found in some applications such as telemetry.
Half Duplex: Transmission is found in many systems such as inquiry applications where in a DTE sends a query to another DTE and waits for applications process to access and or compute the answer and transmit the response back. Terminal based system often use half-duplex techniques.
Full-duplex: Providing for simultaneous two way transmission, without the intervening stop-and-wait aspect of half duplex. Full duplex is widely used in applications requiring continuous channels usage.
Thus for, the terms half duplex and full duplex have been used to describe how data move across the circuits. we have focused on these terms as they are used in the data communication industry. the physical circuit itself, without regard to how data moves. some people in the industry use half duplex and full duplex to describe data flow and the physical circuit it self.
Full Duplex basically is a duplex communication system made up of two associated devices which can communicate with each other in both directions. Duplex system is used in practically all communication networks, moreover to allow for a contact "two-way street" amid two linked parties or to supply a "reverse path" for the monitoring and inaccessible adjustment of tools in the field. A half duplex system supplies communication in both paths, but only one path at a time. Characteristically, once a party starts to receive a signal, it must hold on for the transmitter to stop transmitting, prior to replying.
A full duplex system basically permits communication in both directions, and dissimilar to half duplex, permits this to take place simultaneously. Land line telephone networks are a good example of full duplex system since they permit both the caller to speak as well as be heard at the same time.
Hamm radios are the best way to give an example of simplex communication. Also it is the reason they use a call sign to show they are finished speaking to que the other person they can speak - -over.
Duplex and Full Duplex can be shown by speakerphones. A duplex speakerphone, the speaker cuts out when you talk as it can only do one at a time whereas a full duplex phone you can hear and speak at the same time (makes it more convenient so you don't talk over someone else talking on a conference call.).
